Undelivered Mail - What could I have missed in configuration?

I have 25 users setup and all work fine but my account keeps getting this e-mail about every 20 seconds or so. I am able to send and receive e-mails, this one just happens to keeps showing up in my inbox.

This is the Postfix program at host yyy.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<[email protected]>: Host or domain name not found. Name
service error for name=localhost.localdomain type=A: Host not found

Final-Recipient: rfc822; [email protected]ldomain
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error
for name=localhost.localdomain type=A: Host not found

Also I noticed that the date received is from 20 to 60 minutes before the time it is put into the users Inbox. This E-mail fragment was received at 5:55 am but the header shows it came in at 5:08 am. Could this be significant?

Then I removed the install_ispconfig directory and untar the original 2.2.9 install again. I reran the install and all seems to be working now. I am still getting Undelivered Mail but it looks like it is older mail in the queue to be scanned. Where can I go to remove those from the queue?

One thing I did notice that occured this time that did not happen last time was the install_ispconfig directory was removed. This may have been a sign os a failed upgrade.

Then I removed the install_ispconfig directory and untar the original 2.2.9 install again. I reran the install and all seems to be working now. I am still getting Undelivered Mail but it looks like it is older mail in the queue to be scanned. Where can I go to remove those from the queue?

Click to expand...

Run

Code:

postsuper -d ALL

to delete all mails in the mail queue.

AZMel said:

One thing I did notice that occured this time that did not happen last time was the install_ispconfig directory was removed.

Click to expand...

That's the normal behaviour. It's intended like that and is a good sign.